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Theoretical Chemistry Accounts

, Volume 129, Issue 3–5, pp 303–312 | Cite as

DFT studies of reductive elimination, C–H activation and β-hydride elimination in alkyl and aryl palladium amine complexes

  • Christopher Ryan
  • Alexandra K. de K. Lewis
  • Stephen Caddick
  • Nikolas KaltsoyannisEmail author
Regular Article

Abstract

The factors affecting C–N bond formation via reductive elimination from Pd(I t Bu)(neopentyl)(morpholide) (I t Bu = 1,3-Di-tert-butyl-imidazol-2-ylidene) are studied computationally. DFT calculations indicate that choosing an alkyl group without β hydrides, such as neopentyl, has a detrimental effect on the possibility of C–N reductive elimination. In the absence of β hydride elimination, a pathway of lower energy than reductive elimination is found, namely morpholide-promoted C–H activation of neopentyl t Bu has a significantly lower activation energy than reductive elimination. Changing the ancillary ligand from I t Bu to tricyclopentylphosphine (P(Cyp)3) has little impact. By contrast, replacing neopentyl by phenyl leads to a c. 50% reduction in activation energy. Study of Pd(I t Bu)(2-methylpropyl)(morpholide) permits comparison of the potential energy surfaces for three possible processes; (1) reductive elimination (2) morpholide-promoted C–H activation and (3) β-hydride elimination and reveals that the activation energies for these processes increase in the order of (3) < (2) < (1).

Graphical Abstract

Reductive elimination, C–H activation and β-hydride elimination processes in alkyl and aryl palladium amine complexes are studied computationally, in order to establish why reductive elimination in the alkyl complexes is so elusive.

Keywords

Palladium Organometallic Reductive elimination Beta hydride elimination C–H activation NHC 

Notes

Acknowledgments

We are grateful to EPSRC and BBSRC for support of this project. We also thank UCL for computing resources via the Research Computing “Legion” cluster and associated services, and the reviewers for their helpful comments.

Supplementary material

214_2010_775_MOESM1_ESM.docx (348 kb)
Cartesian coordinates of the optimised geometries of all of the species calculated. (DOCX 347 kb)

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Christopher Ryan
    • 1
  • Alexandra K. de K. Lewis
    • 1
  • Stephen Caddick
    • 1
  • Nikolas Kaltsoyannis
    • 1
    Email author
  1. 1.Department of ChemistryUniversity College LondonLondonUK

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